Tune in This Weekend: ‘Upstairs Downstairs'

Eager costume drama fans waiting for the return of “Downton Abbey” can feast on the second helping of the revival of the “Masterpiece” classic “Upstairs Downstairs” (8 p.m. Sunday, KLRN). The private lives and public follies of the aristocratic class and its stoic servants unfold against the backdrop of gathering war clouds. It's 1938, and Adolf Hitler is determined to invade Czechoslovakia. Authorities issue gas masks as anti-aircraft blimps float over a nervous city.

Sherri Shepherd gets serious in the original TV movie “Abducted: The Carlina White Story” (7 tonight, Lifetime). Based on a real story, “Abducted” recalls the 1987 kidnapping of an infant girl from a New York hospital by a distraught woman, Ann Pettway (Aunjanue Ellis). The story fast-forwards 23 years, when the young woman suspects that Pettway may not be her real birth mother. Shepherd plays the older birth mother, a loving matriarch of a wounded family.

A testament to the ability of people to spend time watching mundane activities, “Parking Wars” (8. and 8:30 tonight, A&E) returns. The reptile-wrangling drama “Billy the Exterminator” (9 p.m. and 9:30 p.m.) is also back with more bayou shenanigans.

“Mythbusters” (7 p.m. Sunday, Discovery) returns with a glance at several Titanic-related “what-ifs.”